Sigma USB Dock for Canon Lenses

Product Description

The USB Dockfor Canon from Sigma allows photographers to
calibrate lenses, update firmware, and customize focus parameters via
Sigma's Optimization Pro software. For the Sports category of lenses,
adjustments can be made to autofocus speed, focus limiters, manual
focus override and optical stabilization functionality. Once the latest
updates have been downloaded from Sigma, simply plug into the USB Dock
and update your lens with the newest firmware. Compatible with Mac OS
and Windows.